Storing Unused Spike Shooter

I can only take half a can of Spike Shooter in a day. I am quite sensitive to stimulants. Can I just keep the unfinished half in another container (i.e. glass jar, travel mug, etc) for later use?

How long can I keep it out of a can without it losing its effects?

Spike Shooter should be fine for a couple of days once opened.

Granted, it will lose carbonation, but you’ll still get the same effect.

I used to drink it half a can at a time, and would just leave the other half right in my mini fridge next to my bed. It did lose carbonation, but it merely tasted alright as opposed to the normal amazing taste.